Update show to root_group

Compatibility with CP9

Author: BlitzCityDIY

examples/wii_classic_displayio_visualizer.py

@@ -27,7 +27,7 @@
 # Make the display context
 splash = displayio.Group()
 splash.append(bg_tilegrid)
-display.show(splash)
+display.root_group = splash
 
 i2c = board.STEMMA_I2C()
 ctrl_pad = adafruit_wii_classic.Wii_Classic(i2c)